How can i stop running a line of code ?

[imene]

How can i stop running a line of code when i get missing items warning here?
missing item = missing table view item (table imported from a csv file)

i don't want to get in this for loop:

for(int i=0;i<a; i++) //R :read , W :write
    {
        QString PayloadData_R = m_ui->Table_CSV->model()->data(m_ui->Table_CSV->model()->index(i,1)).toString();
        qDebug()<< m_ui->Table_CSV->indexAt(QPoint(2,2)).row() << " and " <<  m_ui->Table_CSV->indexAt(QPoint(2,2)).column();
        qDebug()<<"PayloadData_R="<<PayloadData_R;
        QString IdData_R = m_ui->Table_CSV->model()->data(m_ui->Table_CSV->model()->index(i,2)).toString();
        qDebug()<< m_ui->Table_CSV->indexAt(QPoint(2,3)).row() << " and " <<  m_ui->Table_CSV->indexAt(QPoint(2,2)).column();
        qDebug()<<"IdData_R="<<IdData_R;

    if (m_canDevice)....
...}

void MainWindow::on_SendAll_Button_clicked()
{
    int a= m_ui->Table_CSV->model()->rowCount();
    qDebug()<<"int a= m_ui->Table_CSV->model()->rowCount()="<<a; //nombre ligne du tab


    const int rowCount = mModel->rowCount();
    const int colCount = mModel->columnCount();
    for(int ix=0; ix<rowCount; ++ix)
    {   QString item1=getValueAt(ix, 0);
        if(item1=="")
        {qDebug()<<"Missing_item1="<<item1;
        QMessageBox::warning(this,"Warning","Missing items");}

        for(int jx=1; jx < colCount; ++jx)
           { QString item2=getValueAt(ix, jx);
        if(item2=="")
        {
            {qDebug()<<"Missing_item2="<<item2;
            QMessageBox::warning(this,"Warning","Missing items");}

        }
       }
    }




    for(int i=0;i<a; i++) //R :read , W :write
    {
        QString PayloadData_R = m_ui->Table_CSV->model()->data(m_ui->Table_CSV->model()->index(i,1)).toString();
        qDebug()<< m_ui->Table_CSV->indexAt(QPoint(2,2)).row() << " and " <<  m_ui->Table_CSV->indexAt(QPoint(2,2)).column();
        qDebug()<<"PayloadData_R="<<PayloadData_R;
        QString IdData_R = m_ui->Table_CSV->model()->data(m_ui->Table_CSV->model()->index(i,2)).toString();
        qDebug()<< m_ui->Table_CSV->indexAt(QPoint(2,3)).row() << " and " <<  m_ui->Table_CSV->indexAt(QPoint(2,2)).column();
        qDebug()<<"IdData_R="<<IdData_R;

    if (m_canDevice)
    {
        disconnect(m_canDevice.get(), &QCanBusDevice::framesReceived,
                    this, &MainWindow::processReceivedFrames);       //disconnect champ d'envoi alors enable "processReceivedFrames" method
        QCanBusFrame frameconnect; // Declaration nv trame :de type QCanBusFrame container of a single can frame = content "frameId + payload" to send
        //QString ID = IdData_R; //Declaration nv ID :chaine de caractère
        //const uint frameId = ID.toUInt(nullptr, 16); //Declaration nv frameID :conversion de ID (chaine de caractère) to uint(unsgned int taille 16bit)
        //just changed if 101 ***

        if (IdData_R=="Tx"){
        QString ID = "101"; //Declaration nv ID :chaine de caractère
         qDebug() <<"Id Tx"<<ID;
        const uint frameId = ID.toUInt(nullptr, 16); //Declaration nv frameID :conversion de ID (chaine de caractère) to uint(unsgned int taille 16bit)
        //just changed if 101 ***
        frameconnect.setFrameId(frameId); //incertion de FrameId dans uint frameId
        QByteArray payloadconnect= QByteArray::fromHex(PayloadData_R.toLatin1()); //Declaration nv tab of bytes(octets)
                                      //fromHex: Renvoie une copie décodée du tableau encodé en hexadécimal hexEncoded.
        frameconnect.setPayload(payloadconnect);//incertion de FrameId dans uint frameId
        qDebug() << "payload connect to control board" << payloadconnect; //affichage en terminal payloadconnect="\xFF\x00"

        m_canDevice->writeFrame(frameconnect); //envoi ecriture du trame initialement crée (frameconnect) sur canDevice

     //   QMessageBox::information(this,"Done","connect frame sent");
        m_canDevice->waitForFramesReceived(2000); //attend reception trame 2sec snn out
        //Renvoie vrai si de nouvelles trames sont disponibles pour la lecture et que le signal framesReceived() est émis ;
        //sinon renvoie false (si l'opération a expiré ou si une erreur s'est produite).
        QCanBusFrame frametestconnect = m_canDevice->readFrame(); //read m_canDevice trame et stocage dans la nouvelle "frametestconnect"

        QByteArray connectRep = frametestconnect.payload();//recupération de payload du trame

        qDebug() << "trame de test" << connectRep;

        qDebug() << frametestconnect.payload() << " size reponse connect carte de commande" << frametestconnect.payload().size();
        qDebug() << frametestconnect.frameId()<<"rense connect carte de commande" << frametestconnect.payload().size();
        //Test comparaison result recu "connectRep" et resultat attendu "Testconnect"
        QByteArray Testconnect = QByteArray::fromHex("FF00");//"FF00804008000101" Dec de trame qu'il faut recupéré

        if( connectRep[0]==Testconnect[0]){
            qDebug() <<"Test FF good!"; //model dialogue informing
            mModel->item(i, 4)->setText("FF");//ack
            mModel->item(i, 6)->setText("Pass");//result

        }
        else {qDebug() <<"Test bad! connectRep"<<connectRep;
        mModel->item(i, 4)->setText("FE");//ack
        mModel->item(i, 6)->setText("Fail");//result
        }

    }


    }//if 101 ** changeboth send and sendall
}
    QMessageBox::information(this,"Done","Frames are sent successfully");
}

[J.Hilk]

@imene you do know, that you can use return at any point in your function to exit the function ?

Make an appropriated If(condition) check beforehand and you're good to go

[mchinand]

You can also use continue or break depending on what you want your code to do when it encounters a missing item. This is very, very basic C/C++ stuff. https://www.w3schools.com/cpp/cpp_break.asp